944 updated waterpump questions

jk911 · 11-14-2001, 01:22 PM

My '83 944 has un updated waterpump, and the timing belt is not performing as it should (its drifting outwards). Could someone with a bit of know-how answer the following:
1) Does the cam belt tensioner mounting stud need replacing? How it it removed??

2) What is the point of the cam belt smooth roller update? I do have the updated one but doesn't the belt still run the same path!

3)What is the chrome belt guide suppose to do? it just sits there and doesn't interfere with the belt!

4)The updated water pump pulley is wider than the old type, ie 46.2mm as opposed to 32mm. How is the belt suppose to stay on track? Could someone tell me if their belt sits in the middle of this or does it drift to the outer side against the lip?

5)Does anyone have pictures of their setup ie updated waterpump on an older 944??????

I am in desperate need of help as I have changed all belts and rollers on my car but the stupid cam belt is drifting outwards again ! It is rubbing against the outer casing of the distributor metal cover and I have ruined my new timing belt as well!!
I cannot for the life of me work out why this is happening I suspect it is a bent cam belt tensioner mounting stud! But I don't know.

Any help would be greatly appreciated !

Britwrench · 11-14-2001, 04:10 PM

Probably the stud is bent, caused by not holding the tensioner when undoing or torquing to spec. As you are not really sure how this stuff works try and get someone who does know to sort it out or at least help you.

I think the stud you need is 944 102 216 01

44Dwarf · 11-15-2001, 07:27 AM

Has the head ever been off this car? was it plained? has the camshaft box been taken off the head? I've seen several other make OHC engine where the head was plained at a stight angle and the belt whould walk off the cogs cause the crank and the cam were not paralle to each other.

44Dwarf

Britwrench · 11-15-2001, 01:10 PM

I'm still trying to figure out what sort of shop would (could) plane a cylinder head at that sort of angle and not notice!!! and then fit it to the car.....scary

jk911 · 11-15-2001, 02:13 PM

I Don't know what has been done to the car before I purchased it 2 months ago, but I don't think its that because the belt sits off the tensioner roller as well.

I might have to check that the crankshaft sprocket has been put on the correct way ! ie with the lip outwards !
When i changed the belt I didn't remove this or evenlook at it !
This may be the culprit!

I will check it tomorrow !

EGSMachine · EGSMachine's Garage

Quote:

Originally posted by jk944
I Don't know what has been done to the car before I purchased it 2 months ago, but I don't think its that because the belt sits off the tensioner roller as well.

I might have to check that the crankshaft sprocket has been put on the correct way ! ie with the lip outwards !
When i changed the belt I didn't remove this or evenlook at it !
This may be the culprit!

I will check it tomorrow !

i get the impression you are yelling.
just $.02.

Lawrence Coppari · 04:51 AM

Chrome plate is there to reduce lateral movement of cam belt. Belts can vibrate when they operate. It provides a nice smooth (non-abrasive) surface for the belt to contact if it got a little loose. I certainly would leave it on.

Could the tensioner pulley be the wrong one? I am going by memory here but the pulleys have a lip on them. The lip prevents the belt from moving outward/inward. Check a manual to see if you have the correct idler/tensioner pulley. Some have a lip on outside. Some have a lip on inside, close to block. The pulleys are interchangeable so you might have the wrong one mounted.

Just a thought. Good luck.

44Dwarf · 11-16-2001, 05:05 AM

I've seen angle plained heads aleast 5 times in the last five years. I's called let the new kid run the machine shop! It doen't take much to walk the belt off cause the motor is so long. I've seen belts walk off with as little as .006 dif between the head heights.

44

Mrmerlin · 11-16-2001, 02:52 PM

Hi Bro, hey I will bet that Lawrence is on the right track it sounds like you may have the tensioner pulleys swapped........IE the Balance belt tensioner might be on the cam belt pulley and Visa versa..... the Chrome belt guide is there to prevent the timing belt from hitting on itself when the engine is cold or from excess slack in the belt, the teeth will rub on each other till they wear down to nothing.............
Anyway get a picture from your haines manual and look very carefully to see what the tensioner looks like for each belt .........Stan

jk911 · 11-25-2001, 05:22 PM

I finally worked out the problem.
Yes the crankshaft sprocket is on the wrong way around the idiots that changed the belt before put the sprocket on the wrong way around with the lip towards the engine.

Now I purchased another timing belt "again" a new tensioner stud as well.

Now I need to find a flywheel lock but I need to import it from Germany which will take 2 weeks. I have heard of people using screwdrivers but I don't trust myself.
Has anyone used any other means but the flywheel lock ?
Do you need an assistant to hold the screwdriver etc while the crankshaft bolt is loosened tightened ?

Also do I need a torque wrench to tighten the crankshaft bolt or can I just tighten it as hard as possible.

DennisR_944 · 11-25-2001, 11:24 PM

Search the board for what others have done.

Magnus_944 · 11-26-2001, 02:43 AM

I use an old starter as fly wheel look. I think it is from an audi 100 (5000 in usa?), I took it apart and had the gearwheel welded to the axle, put it together again and drilled a 10mm hole half way through it and put a M10 bolt in the hole to prevent it from rotating. Works fine and was cheap.

/Magnus